How effective added CO2 is depends entirely on your grow room, like weedyoo it won't always make a significant differance, and sometimes it won't even make a noticable one. CO2 is a great addition to the growroom and can increase growth rates quite a bit...under the right conditions. Kits are expensive so it's best to know if it's going to be worth it ahead of time, and it's pretty easy to find out.

The reason weedyoo, and most other growers don't see the full advantages is because in 99 out of 100 growrooms the CO2 concentration is not what's holding the plant back. There is always a photoinhibitor so to speak, a limiting factor in your growroom...for most of us more lights would be a far better investment than CO2 supplementation. You really have to consider what else might be limiting your plants growth before you can expect to see any change from more CO2. Chances are for most growers CO2 isn't going to provide a significant growth rate increase, first you have to perfect everything else...lights, ferts, temps.

I don't mean to disagree with catpiss at all, I just think growers (espescially new growers) should be aware that there are a few things they need to worry about before CO2. To see the any real improvement from additional CO2 you should already have at least 100+ watts per sq. foot in your flower room IMO.

__________________